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Abstract

Immersion solder is a process in which connectors are attached to a printed circuit board (PCB) by applying solder to the board while the board and solder are immersed in a heated flux bath. A method of accomplishing this process in a vertical machine is described in the following. A PCB 1 to be immersion soldered is loaded in board-loading rack 2 in a vertical position where an overhead conveyor 3 picks up the board 1 and transports it to a flux tank 4 which holds a process heating bath. As the board 1 is lowered into the flux tank 4, it passes a degassing nozzle 5 located below the flux surface 6 where nozzle 5 forces hot process flux through board plated-through holes (PTHs), pushing out air that was trapped in the PTHs.

Country

United States

Language

English (United States)

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Vertical Immersion Solder Machine

Immersion solder is a process in which connectors are attached to a printed
circuit board (PCB) by applying solder to the board while the board and solder
are immersed in a heated flux bath. A method of accomplishing this process in a
vertical machine is described in the following. A PCB 1 to be immersion soldered
is loaded in board-loading rack 2 in a vertical position where an overhead
conveyor 3 picks up the board 1 and transports it to a flux tank 4 which holds a
process heating bath. As the board 1 is lowered into the flux tank 4, it passes a
degassing nozzle 5 located below the flux surface 6 where nozzle 5 forces hot
process flux through board plated-through holes (PTHs), pushing out air that was
trapped in the PTHs. The PCB 1 is moved from the overhead conveyor 3 to an
indexing conveyor 7 that serves as a preheat buffer to elevate the temperature of
the PCB 1 as it is moved in the direction of a solder nozzle 8. At the bottom of
flux tank 4 a solder pot 9 liquifies the solder so that it may be pumped up by
positive displacement gears (not seen) to the solder nozzle 8 where the PCB 1 is
soldered. The nozzle 8 forces solder over all solder pads and drives solder into
the PTHs, while the PCB 1 is raised vertically past the solder nozzle 8 by
conveyor 3. A solder squeegee 10 is a nozzle which levels off the solder pads
and prevents bridging of solder pads by jetting flux from the bath at an angle and
velocity onto the soldere...